How to find a lost iPhone?

Find your lost iPhone or iPad - Apple Support

Do's and Don'ts for lost iPhones - Switched Off - Offline - Beware of Phishing – Apple Community

ellabarbour Said:

"How to find a lost iPhone?: What do I do if I lost my phone?"

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Troubleshooting a Lost iPhone:

Granted Find My is of no Option...

What to Try:

A. Backtrack your Locations:

Do it the olde fashioned way and backtrack your locations. For instance, if you were at a retail store, then stop in, asking the store manger if it was placed aside.

B. Lost-&-Found:

Chick with the Lost & Found department of the facility you were in, seeing if it has been handed over.

C. Contact Local Authorities:

See if the community police, or local security guards at the front door, can across it.

D. Use Craigslist:

Put a post on Craigslist, seeing if they have been found.

E. Go Here: If your iPhone, iPad, or iPod touch is Lost or Stolen - Apple Support